I used this to lock my new Yamaha 9.9 Hi Thrust kicker to my boat. I thread the chain through one of the towing eyes and then lock the two end chain eyes to the locking eye on the kicker. The chain is a heavy galvanized harden chain 4 feet in length with canvas tube cover. The lock is weather resistant and harden cased, ideal for marine use. I sold my boat and kicker separately and now offering this locking devise, Cost over $140.00 with chain at Price Lock & Key. Wally show contact info